Cosmetic brush

Abstract

A cosmetic brush, including: a main body; a front cover; a rear cover; a brush assembly; and a piston. The main body includes a front part, a rear part, and a liquid storage cavity disposed between the front part and the rear part. The brush assembly is disposed in the front part. The piston is disposed in the rear part. The brush assembly and the piston are disposed at two ends of the liquid storage cavity, respectively. The rear cover is rotatably disposed relative to the main body. The rear cover is provided with a rear cover sleeve, and the rear cover sleeve is fixed on the rear cover. The rear cover includes a threaded rod and a plurality of threaded sleeves. The plurality of threaded sleeves is telescopic and is hinged to one another via screw threads.

What is claimed is: 
     
         1 . A cosmetic brush, comprising:
 a main body, the main body comprising a front part, a rear part, and a liquid storage cavity disposed between the front part and the rear part;   a front cover;   a rear cover;   a brush assembly; and   a piston;   
       wherein:
 the front cover is disposed on the front part and the rear cover is disposed on the rear part; 
 the brush assembly is disposed in the front part; 
 the piston is disposed in the rear part; 
 the brush assembly and the piston are disposed at two ends of the liquid storage cavity, respectively; 
 the rear cover is rotatably disposed relative to the main body; 
 the rear cover is provided with a rear cover sleeve, and the rear cover sleeve is fixed on the rear cover; 
 the rear cover comprises a threaded rod and a plurality of threaded sleeves; 
 the plurality of threaded sleeves is telescopic and is hinged to one another via screw threads, and comprises an innermost threaded sleeve and an outermost threaded sleeve; 
 the threaded rod comprises a first end and a second end; the first end of the threaded rod abuts against the piston, and the second end of the threaded rod is in threaded connection to the innermost threaded sleeve; the outermost threaded sleeve is in threaded connection to the rear cover; and 
 the outermost threaded rod comprises a plurality of axially-distributed grooves, and the rear cover comprises a plurality of axially-distributed ribs corresponding to the grooves; the outermost threaded rod is engaged with the rear cover via the grooves and ribs. 
 
     
     
         2 . The brush of  claim 1 , wherein the piston comprises a polygonal depression;
 the first end of the threaded rod comprises a polygonal terminal corresponding to the polygonal depression; the polygonal terminal is inserted and clamped in the polygonal depression.   
     
     
         3 . The brush of  claim 1 , wherein the brush assembly comprises: a liquid conveying pipe communicating with the liquid storage cavity, a brush hair encircling the liquid conveying pipe, and a brush sleeve sleeving the brush hair. 
     
     
         4 . The brush of  claim 1 , wherein the second end of the threaded rod comprises a first protruding connector comprising first external screws; an inner surface of the threaded sleeve comprises first internal screws corresponding to the first external screws. 
     
     
         5 . The brush of  claim 1 , wherein the threaded sleeve comprises a second protruding connector comprising second external screws; an inner surface of the rear cover comprises second internal screws corresponding to the second external screws. 
     
     
         6 . The brush of  claim 1 , wherein the rear cover comprises a plurality of circumferentially-disposed ratchets; and the ratchets are disposed between the main body and the rear cover.